package me.hushuang.webb.back.util;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * Created by hushuang on 2017/4/12.
 */
public class WebUtils {
    public static String getClientIP(HttpServletRequest request) {
//        String ip = request.getHeader("x-forwarded-for");
//        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//            ip = request.getHeader("Proxy-Client-IP");
//        }
//        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//            ip = request.getHeader("WL-Proxy-Client-IP");
//        }
//        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//            ip = request.getRemoteAddr();
//        }
//        return ip;


        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            //多次反向代理后会有多个ip值，第一个ip才是真实ip
            int index = ip.indexOf(",");
            if (index != -1) {
                return ip.substring(0, index);
            } else {
                return ip;
            }
        }
        ip = request.getHeader("X-Real-IP");
        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            return ip;
        }
        return request.getRemoteAddr();
    }
}
